<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      margin: 0;
    }
    #box {
      position: relative;
      height: 100px;
    }
    ul {
      list-style: none;
      padding: 0;
      margin: 0;
      width: 300%;
      overflow: hidden;
    }
    ul li {
      float: left;
      width: 33.333%;
      height: 100px;
    }
    ul li img {
      width: 100%;
      height: 100px;
    }
    .circle {
      position: absolute;
      right: 10px;
      bottom: 10px;
    }
    .circle span {
      float: left;
      width: 5px;
      height: 5px;
      margin: 0 5px;
      background: #fff;
      border-radius: 2px;
    }
    .circle span.active{
      width: 15px;
    }
  </style>
</head>
<body>
  <div id="box">
    <ul>
      <li><img src="./img/test/focus1.jpg" alt=""></li>
      <li><img src="./img/test/focus2.jpg" alt=""></li>
      <li><img src="./img/test/focus3.jpg" alt=""></li>
    </ul>
    <div class="circle">
      <span class="active"></span>
      <span></span>
      <span></span>
    </div>
  </div>
</body>
</html>